Long ago, I came across SwarmSketch. As better described on their About page:

SwarmSketch is an ongoing online canvas that explores the possibilities of distributed design by the masses. Each week it randomly chooses a popular search term which becomes the sketch subject for the week. In this way, the collective is sketching what the collective thought was important each week.

It’s pretty neat. Sometimes, it really comes together and at others, it’s difficult to tell what the week’s theme is.

Do you know of any projects with a similar community generated concept?